Struktur Komunitas Moluska Bentik di Perairan Sekitar PLTU Grati, Pasuruan, Jawa Timur

Observation on marine benthic molluscs on around of PLTU Grati, Pasuruan was conducted on May and December 2004. The aim of this study is to determine condition and community structure of benthic molluscs living in those areas. Samples was collected using Eckmann grab and sieved through 0.5 mm mesh-sized. The number of molluscs species is 28 species, consist of 16 species class of gastropoda and 12 species class of pelecypoda. A diversity index (H) ranged 0.845 to 1.158, an evenness index (J) was 0.856 to 1 and a richness index (D) was 19.562 to 31.949. Littorina undulata (Littorinidae) dominated species and relatively wide distributed. In generally, this result showed that around PLTU Grati waters had a relatively low benthic molluscs diversity. Biota Jurnal llmiah Ilmu-ilmu Hayati, Vol. 15, No. 3. Hal. 392-399 ISSN 0853-8670